Revert jekyll-scholar bibtex filters (alshedivat#381)

* Revert "Fix latex rendering issue in the bibliography entries (alshedivat#358)"

This reverts commit e328dc6.

* Update mathjax version to 3.2.0

* Add bibtex_filters explicitly to _config.yml

_config.yml

@@ -166,10 +166,13 @@ scholar:
   source: /_bibliography/
   bibliography: papers.bib
   bibliography_template: bib
+  # Note: if you have latex math in your bibtex, the latex filter
+  # preprocessing may conflict with MathJAX if the latter is enabled.
+  # See https://github.com/alshedivat/al-folio/issues/357.
+  bibtex_filters: [latex, smallcaps, superscript]
 
   replace_strings: true
   join_strings: true
-  bibtex_filters:
 
   details_dir: bibliography
   details_layout: bibtex.html